Inch Decimal / Fraction Converter
Convert inch decimal values to common fractions, or convert fractions to decimal inches.
✓ Runs in your browser↔ Metric and inch unitsƒ Formula shown
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Enter machining data
Default values are examples. Replace them with your actual setup data.
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Formula and engineering notes
Formula / logic
Nearest numerator = round(decimal × denominator). The fraction is then reduced to lowest terms.
Nearest numerator = round(decimal × denominator). The fraction is then reduced to lowest terms.
Engineering disclaimer: these tools are for estimating and planning. Verify production parameters with toolmaker catalogs, machine limits, material data, and applicable standards.
Frequently asked questions
Can this result be used directly on a CNC machine?
Use it as a starting value only. Check the tool manufacturer data, machine limits, workholding, coolant and material condition before production.
Which units does the calculator support?
The calculator shows the units beside each input. Select metric or inch units where the page provides a unit-system control.
Why can shop results differ from the calculation?
Tool geometry, coating, runout, rigidity, chip evacuation, material hardness and machine power can change the practical result.